There are more modern word processors that implement many of these features, for example Scrivener[1] and Ulysses[2]. Clipboard managers also help quite a bit, I can't do anything without one these days (but I also have a lot of commonly-used commands and blocks of code stored as snippets in mine, so it isn't just for juggling).

1: http://www.literatureandlatte.com/

2: http://ulyssesapp.com/